SH2B3 inactivation through CN-LOH 12q is uniquely associated with B-cell precursor ALL with iAMP21 or other chromosome 21 gain

In more than 30% of B-cell precursor acute lymphoblastic leukaemia (B-ALL), chromosome 21 sequence is overrepresented through aneuploidy or structural rearrangements, exemplified by intrachromosomal amplification of chromosome 21 (iAMP21). Although frequent, the mechanisms by which these abnormaliti...

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Veröffentlicht in:Leukemia 2019-08, Vol.33 (8), p.1881-1894
Hauptverfasser: Sinclair, Paul B., Ryan, Sarra, Bashton, Matthew, Hollern, Shaun, Hanna, Rebecca, Case, Marian, Schwalbe, Edward C., Schwab, Claire J., Cranston, Ruth E., Young, Brian D., Irving, Julie A. E., Vora, Ajay J., Moorman, Anthony V., Harrison, Christine J.
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container_end_page 1894
container_issue 8
container_start_page 1881
container_title Leukemia
container_volume 33
creator Sinclair, Paul B.
Ryan, Sarra
Bashton, Matthew
Hollern, Shaun
Hanna, Rebecca
Case, Marian
Schwalbe, Edward C.
Schwab, Claire J.
Cranston, Ruth E.
Young, Brian D.
Irving, Julie A. E.
Vora, Ajay J.
Moorman, Anthony V.
Harrison, Christine J.
description In more than 30% of B-cell precursor acute lymphoblastic leukaemia (B-ALL), chromosome 21 sequence is overrepresented through aneuploidy or structural rearrangements, exemplified by intrachromosomal amplification of chromosome 21 (iAMP21). Although frequent, the mechanisms by which these abnormalities promote B-ALL remain obscure. Intriguingly, we found copy number neutral loss of heterozygosity (CN-LOH) of 12q was recurrent in iAMP21-ALL, but never observed in B-ALL without some form of chromosome 21 gain. As a consequence of CN-LOH 12q, mutations or deletions of the adaptor protein, SH2B3 , were converted to homozygosity. In patients without CN-LOH 12q, bi-allelic abnormalities of SH2B3 occurred, but only in iAMP21-ALL, giving an overall incidence of 18% in this sub-type. Review of published data confirmed a tight association between overrepresentation of chromosome 21 and both CN-LOH 12q and SH2B3 abnormalities in B-ALL. Despite relatively small patient numbers, preliminary analysis linked 12q abnormalities to poor outcome in iAMP21-ALL ( p  = 0.03). Homology modelling of a leukaemia-associated SH2 domain mutation and in vitro analysis of patient-derived xenograft cells implicated the JAK/STAT pathway as one likely target for SH2B3 tumour suppressor activity in iAMP21-ALL.
doi_str_mv 10.1038/s41375-019-0412-1
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Homology modelling of a leukaemia-associated SH2 domain mutation and in vitro analysis of patient-derived xenograft cells implicated the JAK/STAT pathway as one likely target for SH2B3 tumour suppressor activity in iAMP21-ALL.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>30816328</pmid><doi>10.1038/s41375-019-0412-1</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-1190-9469</orcidid><oa>free_for_read</oa></addata></record>
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issn 0887-6924
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language eng
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source MEDLINE; Springer Nature - Complete Springer Journals
subjects 38/22
38/32
45/23
45/61
631/67/1990/283/2125
631/67/395
631/67/69
692/308/2056
96/1
96/21
Abnormalities
Acute lymphoblastic leukemia
Adaptor Proteins, Signal Transducing
Aneuploidy
Cancer Research
Chromosome 21
Chromosome Aberrations
Chromosomes
Chromosomes, Human, Pair 12
Chromosomes, Human, Pair 21
Copy number
Critical Care Medicine
Deactivation
Hematology
Heterozygosity
Homology
Homozygosity
Humans
Inactivation
Intensive
Interleukin-7 - pharmacology
Internal Medicine
Intracellular Signaling Peptides and Proteins
Leukemia
Loss of Heterozygosity
Lymphocytes B
Medicine
Medicine & Public Health
Mutation
Oncology
Precursor B-Cell Lymphoblastic Leukemia-Lymphoma - genetics
Precursors
Proteins - genetics
STAT5 Transcription Factor - physiology
Tumors
Xenografts
Xenotransplantation
title SH2B3 inactivation through CN-LOH 12q is uniquely associated with B-cell precursor ALL with iAMP21 or other chromosome 21 gain
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